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1
Lightly oil two 15 1/2-inch-long jelly roll pans or a clean, flat work surface, preferably of marble or another cool material.
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2
Place the butter in a large heavy-bottomed saucepan over medium heat.
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3
When melted, stir in the sugar and corn syrup and raise the heat to high.
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4
Clip a thermometer to the side of the pan and cook, stirring constantly, for about 4 minutes, or until the mixture comes to a boil.
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5
Continue to boil, stirring constantly, for about 15 minutes, or until the mixture is golden brown and registers 315F on the thermometer.
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6
Remove from the heat and stir in the salt and baking soda, taking care, as the soda will cause the mixture to boil up.
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7
Stir in the vanilla.
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8
Add the pumpkin seeds and cranberries, stirring to thoroughly blend.
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9
Pour an equal amount of the hot mixture into each oiled pan (or onto the oiled surface), spreading it out to about 1/4 inch thick with an offset spatula.
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10
When the brittle has set, use a sharp chefs knife to crack it into individual pieces.
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11
Place one or two wire racks on parchment paper.
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12
Place the tempered chocolate in a warmed bowl and, using tongs, dip each piece of brittle into the chocolate, lifting it up to allow the excess chocolate to drip off.
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13
Place the chocolate-dipped brittle on the wire racks to set.
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14
You may have to dip a couple of times to completely cover the candy.
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15
You may also dip only half of each piece.
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16
If so, dip on the bias for a more attractive pattern.
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17
Let stand for about 30 minutes, or until the chocolate has hardened completely.
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18
Serve immediately or store layered in an airtight container, for up to 1 week.